{
  "manageEntity": {
    "action": "Save",
    "entityId": "2145511567",
    "entityType": "Track",
    "nonce": "0x974147cfb8ed0e5c7b21ecd392f9b121ff160f2aa7ff4629e5f2445bd811b11e",
    "signature": "0x4fd11fa6bd5a94aa3ff6fe45350cfb8619ecf6c83fcc85c7b53e2d13280742f90c5ab4f370a0b95ab338bb2b424df181d6c97b27e3b1841adeff59300019af321c",
    "signer": "0x0b901AE3Eb7b439095858D82Ff194CfeD0Fd3396",
    "userId": "167557"
  }
}